Acoustic emission behavior generated from active waveguide during shearing process

作者：Yang Chen, Hongyong Yuan, Lizheng Deng, Rui Pan, Jianguo Chen, Lida Huang, Mingzhi Zhang · 发表于：Journal of Rock Mechanics and Geotechnical Engineering · 年份：2025 · DOI：10.1016/j.jrmge.2025.01.015 · 被引用次数：4 · 研究领域：Landslides and related hazards、Geotechnical Engineering and Underground Structures、Rock Mechanics and Modeling

Compared to existing deformation monitoring methods, landslide early warning can be achieved by detecting precursor signals of slope instability through acoustic emission (AE). Acquisition of AE signals generated by active waveguide facilitates monitoring the development of shear surface and provides a foundation for quantifying landslide movement. Backfill particles are the dominant AE sources in active waveguides, typically chosen from materials such as gravels or sands. However, the influence of particle sizes and gradings has not been clarified in existing laboratory models or field monitoring. This research introduces a direct shear test for active waveguide, where spherical glass beads are employed to precisely regulate the size and grading of backfill particles. A programmable logic controller maintains a constant shearing speed and equivalent total deformation. Through a comprehensive analysis of AE, deformation, and mechanical measurements, this study evaluates the impact of particle size and grading on monitoring capabilities. The findings suggest that the AE mechanism in glass beads is attributed to particle collision and dislocation, leading to AE events characterized by low amplitude and energy levels. The percentage of high-amplitude AE events rises steadily with the progression of shearing. The correlation between shear force, cumulative ring down count (RDC) of AE, and deformation conforms to a power function, with the exponent relying on particle size, gradin...